Decimal Hours Calculator
Convert hours and minutes to decimal hours for payroll and timesheets — or convert decimal hours back to HH:MM. Enter 7:45 to get 7.75, enter 1.25 to get 1h 15m. Common values: 0.25 = 15 min, 0.50 = 30 min, 0.75 = 45 min, 1.5 = 1h 30m. Includes a quick-reference chart for the most common conversions.
Convert between HH:MM and decimal hours in one click — essential for payroll systems, invoicing, and timesheet entry.
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Quick Reference
Formula
Decimal Hours = Hours + (Minutes ÷ 60)
Divide the minutes by 60 to get the fractional part, then add the whole hours. For example: 7h 45m = 7 + (45 ÷ 60) = 7.75 decimal hours.
Worked Example
Scenario: A freelancer tracks 3 sessions: 2h 15m, 1h 45m, and 3h 30m. They need to invoice using decimal hours.
2h 15m = 2 + 15/60 = 2.25
1h 45m = 1 + 45/60 = 1.75
3h 30m = 3 + 30/60 = 3.50
Total: 2.25 + 1.75 + 3.50 = 7.50 decimal hours
At £80/hr, invoice amount = 7.50 × £80 = £600.00.
Common Mistakes
- Entering 45 minutes as 0.45 decimal. Minutes and decimal fractions are different. 45 minutes = 0.75, not 0.45.
- Adding HH:MM values directly. 7h 45m + 7h 30m ≠ 14h 75m. Always convert to decimal first, add, then convert back if needed.
Guide
How to Use
- 1
Choose the conversion direction
HH:MM → Decimal converts hours and minutes into a decimal. Decimal → HH:MM reverses it.
- 2
Enter your value
Type the hours and minutes, or the decimal number you want to convert.
- 3
Click Convert
The result appears instantly.
- 4
Copy to clipboard
Use the copy button to paste directly into payroll software or an invoice.
Next Steps
What to do next
FAQ
Frequently Asked Questions
Related by Workflow
Related by Region
Why payroll and invoicing use decimal hours
Most payroll systems and invoicing tools expect time entered as a decimal number, not as hours and minutes. This is because multiplying decimal hours by a pay rate is straightforward arithmetic: 7.5 hours × £20/hr = £150. Doing the same with hours and minutes requires an intermediate conversion step that is easy to get wrong.
The key thing to remember: decimal hours are not the same as decimal minutes. 7 hours 45 minutes is not 7.45 hours — it is 7.75 hours. The confusion arises because 45 minutes represents 75% of an hour (45 ÷ 60 = 0.75), not 45%. This is one of the most common timesheet entry errors.
Similarly, when converting decimal hours back to minutes, multiply the decimal fraction by 60. So 0.5 hours = 0.5 × 60 = 30 minutes, and 2.25 hours = 2 hours and (0.25 × 60) = 15 minutes.
Common use cases by role
Payroll administrators
Employees clock in and out in HH:MM format, but payroll systems accept decimal hours. A shift of 7h 30m entered into payroll should be 7.50, not 7.30. This calculator converts a full day's timesheet entries in seconds.
Freelancers and contractors
Freelance invoices are typically calculated as hours × rate. If you worked 2h 15m, 3h 45m, and 1h 30m across three tasks, convert each to decimal (2.25 + 3.75 + 1.50 = 7.50) and multiply by your rate. Avoids arithmetic errors on client invoices.
Project billing
Project managers billing time to clients need accurate decimal totals per project. Rounding errors compound across multiple team members. Using a decimal hours converter for each tracked session before summing eliminates accumulated rounding drift.
Overtime calculation
Overtime rates apply above a threshold (e.g. 8 hours per day). A shift of 9h 15m = 9.25 decimal hours. Regular hours: 8.00. Overtime hours: 1.25. At 1.5× rate, overtime pay = 1.25 × rate × 1.5. Decimal format makes this straightforward.
Need total hours worked across a shift?
The Decimal Hours Calculator converts a known hours-and-minutes value. If you need to calculate total hours between a start time and end time (with break deductions), use the Work Hours Calculator first, then convert the result here.
Common calculations
How do I convert hours and minutes to decimal hours?
Decimal hours = hours + (minutes ÷ 60). Examples: 7h 45m = 7 + (45 ÷ 60) = 7.75. 2h 15m = 2.25. 0h 30m = 0.50. 0h 45m = 0.75. Enter the HH:MM value in the calculator above for an instant result.
How do I convert decimal hours back to hours and minutes?
Hours = the whole number part. Minutes = decimal fraction × 60. Example: 8.75 hours → 8 hours and (0.75 × 60) = 45 minutes = 8h 45m. 3.5 hours = 3h 30m. The calculator converts in both directions.
How do decimal hours work for payroll?
Payroll systems multiply decimal hours by a pay rate: 7.75 hours × £20/hr = £155. The critical rule: 7h 45m is 7.75, not 7.45. Entering 7.45 in payroll overpays (7.45 × £20 = £149 — £6 short) or underpays. Always convert before entry.
How do I convert a timesheet to decimal hours?
Convert each session: Mon 8h 30m = 8.50, Tue 7h 45m = 7.75, Wed 8h 00m = 8.00, Thu 8h 15m = 8.25, Fri 7h 30m = 7.50. Weekly total: 40.00 decimal hours. Sum the decimal values rather than adding HH:MM columns to avoid rounding errors.
How do I calculate billable hours for an invoice?
Sum your decimal hours for the billing period and multiply by your rate. Example: 3 sessions — 2.50 + 3.75 + 1.25 = 7.50 hours × £65/hr = £487.50. Use the Business Days Calculator to confirm the billing period, and Invoice Due Date to set the payment due date.
Next Steps
Next, you may also need
Payroll & billing workflow
From timesheet to invoice — step by step
Decimal hours are typically the midpoint in a payroll or billing workflow. The sequence runs from total hours worked, through decimal conversion, to invoice preparation and payment scheduling.
- 1Calculate total hours worked between start and end times
Enter clock-in/out times and break duration → total HH:MM
- 2Convert HH:MM to decimal hours for payroll
You are here — e.g. 7h 45m → 7.75
- 3Count working days in the billing period
Useful for verifying day-rate totals and leave calculations
- 4Find the invoice payment due date
Net 7, Net 14, Net 30 or custom terms from invoice date
- 5Check the due date falls on a working day
Confirms date is not a weekend or public holiday
Decision guide
Which calculator do you need?
Working with timesheets or billable hours?
Use UtilityPilot for quick calculations, then manage payroll, billing or time tracking in your preferred business system.
Time workflow options coming soon